Measurement of the acoustical impedance of a black box at low frequencies using a shorter impedance tube

Kathuriya, M. L. ; Munjal, M. L. (1977) Measurement of the acoustical impedance of a black box at low frequencies using a shorter impedance tube Journal of the Acoustical Society of America, 62 (3). pp. 751-754. ISSN 0001-4966

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Official URL: http://asadl.org/jasa/resource/1/jasman/v62/i3/p75...

Related URL: http://dx.doi.org/10.1121/1.381546

Abstract

For the experimental evaluation of the acoustical impedance of a termination by the impedance-tube method at low frequencies, the length of the impedance tube is a problem. In the present paper, the method of exact analysis of standing waves developed by the authors for the stationary medium as well as for mean flow, has been extended for measurement of the acoustical impedance of a termination at low frequencies. The values of the tube attenuation factor and the wave number at the low frequency of interest are established from the experiment conducted, with the given impedance tube, at a higher frequency. Then, exciting the tube at the desired low frequency it is sufficient to measure sound pressure at three differenct locations (not necessarily the minima) in order to evaluate reflection coefficient and hence the impedance of the termination at that frequency.

Item Type:Article
Source:Copyright of this article belongs to Acoustical Society of America.
ID Code:73677
Deposited On:07 Dec 2011 05:12
Last Modified:07 Dec 2011 05:12

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